Help-My 98 Sebring Coupe has recently starting this weird surging at approx. 60 MPH-SHe doesn't do it all the time only sporadically-usually from 2.25 rpm up to 2.50-she does have some higher mileage 165K. Any suggestions would be most helpful. Thanks in advance!!

 

Might want to check for vacuum leaks, also, egr system. Have you checked for codes?

 

I plan on working on her this weekend-I've got some extra time & see what I come up with. Thats for extra info.